Osaka has the besssssst specialty sushi. I can't compare them to anybody else. Their fish is so fresh. Their rolls are quite big (which I LOVE), but I know some people who do not like large sushi rolls.
I have also tried their ramen..it was okay. I had the bbq pork ramen. The pork was not very flavourful and it was quite small.
My boyfriend loves their donburi bulgogi. It is very flavourful.
I have had their udon as well, which is great when its a cold day!
As for their service, they are usually very busy, but at the booths they have these buttons which you can press, they come check on you as pretty soon after pressing the button.